Mr. Seemy finds Vickie sitting sadly in the hallway, holding a basketball. “What’s wrong, Vickie?” Mr. Seemy asks.

“I’m not eligible to play in the game tonight,” Vickie says. “Our coach made good grades a prerequisite. I try to maintain a strong B in each class, but I failed a history test last week and an English test the previous week. I’m so frustrated! I’ll probably just quit the team.”

“Don’t do that!” says Mr. Seemy. “Basketball can help you keep your grades up. Exercise affects your brainpower.”

“Really?” asks Vickie.

“Let’s investigate!” says Mr. Seemy.

Some of the students in Mr. Seemy’s class volunteer to participate in a study Vickie does on physical activity and memory. Her notes are shown below.